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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 10:23 - 23 Jan 2020 Post subject: |
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So the outside spinny bit is rubbing against the inside wiring thingy?
Sounds like the engine's suffered from a massive knock in the past and now things don't line up anymore
Is it the Woodruff key that's sheared? That's not normal ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Jay2903 |
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Jay2903 Scooby Slapper
Joined: 03 May 2016 Karma :
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Jay2903 |
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Jay2903 Scooby Slapper
Joined: 03 May 2016 Karma :
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Tankie |
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Tankie Crazy Courier
Joined: 24 Feb 2017 Karma :
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Posted: 18:11 - 23 Jan 2020 Post subject: |
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Jay2903 wrote: | Teflon-Mike wrote: | The Montesa motors, especially the Cota trials versions with a heavier mag-rotor for slow-running were notorious for sheared keys; I've lost about half a dozen over the years. When 'new' it was usually caused by the rotor not being so carefuly fitted. When old/Resto'd, it was a similar looseness, usually caused by a little surface rust on the rotor and or crank taper, and or looser worn rotor nut.
On resto, the advice was to use a little valve lapping past on the crank-shaft, and spend indeterminate hours working the rotor back and forth on the crank taper to a) get the surfaces properly clean of any surface rust and or crud' b) clean thoroughly with thinners (esp after lapping with valve past) c) To critically fit the rotor onto the crank, which meant using a copper mallet to actually get the rotor to interference fit to the crank taper, rather than merely relying on the pressure made by the, probably worn, rotor nut.
If that's any ideas for you. |
Cheers, I’ve been looking at it and I can see the problem.
The inside of the rotor is rubbing against the field coil as you’ll probably be able to see in the image of the rotor. Any ideas what’s causing it ?
(I can’t upload the image of the field coil because the file is too large but that also has scratches like the ones on the rotor) |
Check for float and runout on the end of the crank, if all is fine try to reposition the windings ____________________ Always learning, everyday is a school day |
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mentalboy |
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mentalboy World Chat Champion
Joined: 05 May 2012 Karma :
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Teflon-Mike |
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Teflon-Mike tl;dr
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jaffa90 |
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jaffa90 World Chat Champion
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wintelf94 |
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wintelf94 Two Stroke Sniffer
Joined: 12 Nov 2019 Karma :
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Old Thread Alert!
The last post was made 4 years, 62 days ago. Instead of replying here, would creating a new thread be more useful? |
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